Iota2 Cygni

Iota² Cygni

Observation data Epoch J2000      Equinox J2000
Constellation	Cygnus
Right ascension	19^h 29^m 42.36^s[1]
Declination	+51° 43′ 47.2″[1]
Apparent magnitude (V)	3.77[2]
Characteristics
Spectral type	A5V[3]
B−V color index	+0.15 [2]
Astrometry
Radial velocity (Rv)	-19.50[4] km/s
Proper motion (μ)	RA: +20.59[2] mas/yr Dec.: +128.33[2] mas/yr
Parallax (π)	26.88 ± 0.11[1] mas
Distance	121.3 ± 0.5 ly (37.2 ± 0.2 pc)
Absolute magnitude (MV)	0.92 [5]
Details
Radius	1.90 [6] R☉
Other designations
10 Cygni, FK5 733, GC 26947, HIP 95853, HR 7420, HD 184006, SAO 31702 [2]
Database references
SIMBAD	data

Iota² Cygni (ι² Cyg, often simply called ι Cyg^[7]) is a star in the constellation Cygnus. Its apparent magnitude is 3.77^[2] Located around 37.20 parsecs (121.3 ly) distant,^[1] it is a blue-white main-sequence star of spectral type A5V,^[3] a star that is currently fusing its core hydrogen. Based on rapid changes in the strength of a singly-ionized calcium absorption line, the star is likely host to a circumstellar disk.^[8]

References

1. van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
2. "Iota Cygni". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 24 July 2015.
3. Chesneau, O.; Dessart, L.; Mourard, D.; Bério, Ph.; Buil, Ch.; Bonneau, D.; Borges Fernandes, M.; Clausse, J. M.; Delaa, O.; Marcotto, A.; Meilland, A.; Millour, F.; Nardetto, N.; Perraut, K.; Roussel, A.; Spang, A.; Stee, P.; Tallon-Bosc, I.; McAlister, H.; Ten Brummelaar, T.; Sturmann, J.; Sturmann, L.; Turner, N.; Farrington, C.; Goldfinger, P. J. (2010). "Time, spatial, and spectral resolution of the Hα line-formation region of Deneb and Rigel with the VEGA/CHARA interferometer". Astronomy and Astrophysics. 521: A5. arXiv:1007.2095. Bibcode:2010A&A...521A...5C. doi:10.1051/0004-6361/201014509.
4. Wilson, R. E. (1953), General Catalogue of Stellar Radial Velocities, Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W, LCCN 54001336
5. Absolute magnitude calculated as $M = m + 5 (1 + \log_{10}{p})\!\,$, where $M$ is the star's absolute magnitude, $m$ is the star's apparent magnitude, and $p$ is the star's measured parallax in arcseconds.
6. Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition", Astronomy and Astrophysics, 367: 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451 Vizier catalog entry
7. Kaler, Jim. "Kappa, Iota Cygni". Retrieved 2016-05-19.
8. Montgomery, Sharon L.; Welsh, Barry Y. (October 2012). "Detection of Variable Gaseous Absorption Features in the Debris Disks Around Young A-type Stars". Publications of the Astronomical Society of the Pacific. 124 (920): 1042–1056. Bibcode:2012PASP..124.1042M. doi:10.1086/668293.